Whenever we hear what we assume are the thoughts of a character within a scene, either as random thoughts or as a sustained monologue, this is known as

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Quizplus · Accepted Answer

The best choice is D - internal sound. This is because thoughts are not audible to other characters or to the audience, but are instead happening inside the mind of the character. This is distinct from external sound, which is any sound that the characters can hear, and on-screen sound, which is any sound that is part of the image on screen. Simultaneous sound refers to the use of multiple sound sources at the same time, and overlapping sound occurs when sounds from different scenes or sources are played over each other.

Whenever We Hear What We Assume Are the Thoughts of a Character